docs: def plot_pyro(calc_id=-1):
      """
      Plot the pyroclastic cloud and the assets
      """
      # NB: matplotlib is imported inside since it is a costly import
      import matplotlib.pyplot as p
      dstore = util.read(calc_id)
      sitecol = dstore['sitecol']
      asset_risk = dstore['asset_risk'].value
      pyro, = numpy.where(dstore['multi_peril']['PYRO'] == 1)
      lons = sitecol.lons[pyro]
      lats = sitecol.lats[pyro]
      p.scatter(lons, lats, marker='o', color='red')
  
      building_pyro, = numpy.where(asset_risk['building-PYRO'] == 1)
      lons = sitecol.lons[building_pyro]
      lats = sitecol.lats[building_pyro]
      p.scatter(lons, lats, marker='.', color='green')
      p.show()